Antibacterial resin composition

ABSTRACT

An antibacterial resin composition comprising a thermoplastic resin or a thermosetting resin that contains a metal compound represented by the following formula (1), permitting the metal such as silver having antibacterial power to efficiently elute out and the eluted metal to remain stable as metal ions so that excellent antibacterial power can be exhibited using only a decreased amount of an expensive compound containing silver or the like, 
     
       
         
         
             
             
         
       
         
         
           
             wherein M is any one of Ag, Cu, Zn, Co or Ni, and X is an atom selected from C, O, S and P, or an atomic group thereof.

TECHNICAL FIELD

This invention relates to an antibacterial resin composition and, morespecifically, to an antibacterial resin composition which permitsantibacterial substances such as silver and the like made present in theresin to efficiently elute out and the eluted metals to remain stable asions thereof so that excellent antibacterial power can be exhibited.

BACKGROUND ART

In recent years, a variety of antibacterial compositions have beenproposed for use in public places such as straps, for use as materialsrelated to the houses such as wall papers and furnishings, for use asfilters of the air conditioners and, further, for use as variousproducts such as stationeries that require antibacterial property inaddition to being used for the products such as medical supplies andcontainers that are used under high-temperature and highly humidconditions like in a kitchen, bath room and toilet room where germs andmolds can easily multiply.

For example, the following patent document 1 discloses a compositioncontaining a solvent, silver nano-particles and a stabilizer, and thefollowing patent document 2 discloses an antibacterial compositioncontaining an organosilver type antibacterial agent and an organicantibacterial agent.

The present inventors have proposed already a resin composition (patentdocument 3) containing ultrafine metal particles having an organic acidcomponent on the surfaces of the ultrafine metal particles as the resincomposition that is capable of immunologically inactivating allergenicsubstances consisting of plant proteins such as cedar pollen and thelike and animal proteins such as ticks, excrements thereof, molds andthe like.

PRIOR ART DOCUMENTS Patent Documents

-   Patent document 1: JP-T-2008-508321-   Patent document 2: JP-A-2010-248124-   Patent document 3: International Publication WO2008/69034

OUTLINE OF THE INVENTION Problems that the Invention is to Solve

The composition disclosed in the above patent document 1 comprises adispersion solution which is obtained by dispersing silvernano-particles in a solvent, and is used to impart antibacterialproperty by bringing the dispersion solution into contact with thesurface of the base body to which the antibacterial property is to beimparted. Therefore, the dispersion solution cannot be fixed to the basebody to a sufficient degree, and is not still fully satisfactory inregard to sustaining the effect thereof.

The compositions disclosed in the patent documents 2 and 3 are not theones that are to be used being applied onto the formed article that hasbeen formed in advance unlike that of the patent document 1, but are theones used in combination with a resin to impart antibacterial propertyto the formed article of the resin, offering advantage from thestandpoint of productivity and sustenance of the effect.

From the economical point of view, however, it has been desired thatthese antibacterial resin compositions, too, exhibit antibacterialproperty comparable to or superior to those of the conventional propertybut using expensive substances such as silver and the like in amountsless than the amounts used so far, yet maintaining excellentantibacterial property.

Namely, in order for the antibacterial resin composition to exhibitantibacterial effect, it is important that metal ions such as of silveror the like act on the bacteria. That is, metal ions such as silver ionsmust elute out from the resin composition. However, it was so fardifficult to have the silver present in the formed body of theantibacterial resin composition efficiently eluted out onto the surfaceof the formed body, and there remained a problem in that the silvercompound present in the formed body could not be effectively utilized.

Besides, the eluted metal ions and, specifically, silver in the state ofions were unstable readily turning into metal silver or a silvercompound, and the antibacterial effect could not be efficientlyattained.

It is, therefore, an object of the present invention to provide anantibacterial resin composition which is excellent in economy and inantibacterial property, and uses a decreased amount of an expensivecompound containing silver or the like as a result of permitting themetal such as silver having antibacterial power to efficiently elute outand the eluted metal to remain stable as metal ions.

Another object of the present invention is to provide an antibacterialresin composition having excellent antibacterial power not only in theinitial stage of starting the use but even after the passage of time.

Means for Solving the Problems

According to a first aspect of the invention, there is provided anantibacterial resin composition comprising a thermoplastic resin or athermosetting resin that contains a metal compound (hereinafter “metalcompound (1)”) represented by the following formula (1),

-   -   wherein M is any one of Ag, Cu, Zn, Co or Ni, and X is an atom        selected from C, O, S and P, or an atomic group thereof.

In the above antibacterial resin composition, it is desired that themetal compound (1) is contained in an amount of 0.001 to 10 parts byweight per 100 parts by weight of the thermoplastic resin or thethermosetting resin.

According to a second aspect of the invention, there is provided anantibacterial resin composition comprising a thermoplastic resin or athermosetting resin blended with at least one kind of fatty acid metalsalt selected from Ag, Cu, Zn, Co and Ni, and a compound (hereinafter“compound (2)”) represented by the following formula (2),

-   -   wherein M′ is any one of Na, K or H, and X is an atom selected        from C, O, S and P, or an atomic group thereof.

In the above antibacterial resin composition, it is desired that thefatty acid metal salt is contained in an amount of 0.001 to 10 parts byweight and the compound (2) is contained in an amount of 0.001 to 30parts by weight per 100 parts by weight of the thermoplastic resin orthe thermosetting resin.

According to a third aspect of the invention, there is provided anantibacterial resin composition comprising a thermoplastic and/orthermosetting resin blended with a metal-carrying compound carrying atleast one kind of metal ions selected from Ag, Cu, Zn, Co and Ni, andthe above compound (2).

In the above antibacterial resin composition, it is desired that themetal-carrying compound carrying the metal ions is contained in anamount of 0.001 to 10 parts by weight and the compound (2) is containedin an amount of 0.001 to 30 parts by weight per 100 parts by weight ofthe thermoplastic resin or the thermosetting resin.

According to the present invention, further, there is provided anantibacterial resin formed body obtained by mixing, heating and formingthe above antibacterial resin composition.

Effects of the Invention

In the antibacterial resin composition according to the first aspect ofthe invention, the metal compound (1) has excellent oleophilic andhydrophilic properties. Therefore, the metal compound (1) has excellentaffinity to the resin, disperses excellently in the resin and,therefore, metal ions such as of silver elute out onto the surface ofthe resin from the metal compound that is dispersed enablingantibacterial property to be efficiently exhibited.

In the antibacterial resin compositions of the second and third aspectsof the invention, the thermoplastic resin or the thermosetting resin isblended with the compound (2) in combination with either at least onekind of fatty acid metal salt selected from group Ag, Cu, Zn, Co and Nior a metal-carrying compound carrying at least one kind of metal ionsselected from Ag, Cu, Zn, Co and Ni, making it possible to provide aresin formed body or a coating having the same antibacterial effect asthat of when the metal compound (1) is directly added to thethermoplastic resin or the thermosetting resin.

That is, upon making the fatty acid metal salt or the metal-carryingcompound present together with the compound (2) in the resin, metal ionseluted out from the fatty acid metal salt or the metal-carrying compoundare allowed to stay together with the compound (2) maintainingstability; i.e., the metal ions and the compound (2) elute outsimultaneously from the interior of the resin to exhibit excellentantibacterial property.

The antibacterial resin composition of the invention can effectivelyutilize the compound that contains metals such as silver and the likehaving antibacterial power. This makes it possible to decrease theamount of use of the compound that contains metals such as silver andthe like, and offers advantage in economy.

Further, the resin composition makes it possible to efficiently utilizethe metal compound (1), the compound (2) and the fatty acid metal saltor the metal-carrying compound that are present therein. In the initialperiod, the compound present on the surfaces exhibits antibacterialproperty and after the passage of time, the compound present inside theresin composition migrates onto the surfaces to exhibit antibacterialproperty enabling the antibacterial property to be exhibited overextended periods of time.

The above-mentioned action and effect of the antibacterial resincomposition of the present invention will become obvious from theresults of Examples described later.

That is, the films comprising the antibacterial resin compositions ofthe present invention (Examples 1 to 16) exhibit excellent antibacterialeffect being blended with the compounds (compound (1) or compound (2) incombination with either the fatty acid metal salt or the metal-carryingcompound) in amounts as specified, which could not be obtained to asufficient degree with the films (Comparative Examples 1 to 20)comprising the resin compositions blended with silver stearate,phthalazone silver, benzotriazole silver, 1,8-naphthalimide silver orcommercially available antibacterial agents. It is, therefore, obviousthat silver ions are efficiently eluting out from the resin compositionsof the present invention and excellent antibacterial property is beingexhibited.

Further, the results of the Examples tell that the effect similar to theExamples is obtained by neither the phthalazone silver (ComparativeExamples 7 to 10) nor the benzotriazole silver (Comparative Examples 11to 14). It is, therefore, learned that in the present invention, aportion comprising a five-membered ring and a benzene ring in the metalcompound (1) and the compound (2) is effective in stabilizing the silverions, and that what is important to improve antibacterial property is topossess a heterocyclic ring comprising the five-membered ring and thefive-membered ring having —CO—N—.

BRIEF DESCRIPTION OF THE DRAWINGS

[FIG. 1] is a diagram showing the measured results of the silverconcentrations of the metal compounds.

[FIG. 2] is a diagram showing the measured results of the amounts ofsilver eluted out in Example 2 and Comparative Examples 4 and 8.

MODES FOR CARRYING OUT THE INVENTION (Metal Compounds (1))

As the concrete metal compounds represented by the above formula (1) andused in the first aspect of the invention, there can be exemplified thefollowing ones though the invention is in noway limited thereto only. Inthe following formulas, Ag can be replaced by Cu, Zn, Co or Ni.

Among the above compounds according to the present invention, saccharinsilver can be preferably used.

FIG. 1 is a diagram showing the results of the silver concentrations ofvarious silver-containing compounds eluted out in 1-octanol or in wateras measured in compliance with the JIS Z 7260-107. The results tell thatthe saccharin silver has hydrophilic property and oleophilic propertywhich are both superior to those of silver stearate, phthalazone silveror benzotriazole silver, and enables the antibacterial resin compositionto exhibit excellent properties in agreement with the results ofExamples that will appear later.

(Compounds (2))

As the compounds (2) represented by the above formula (2), there can beexemplified the following ones though the invention is in no way limitedthereto only. In the compounds of the following formulas, Na can bereplaced by K or H.

In the present invention as described above, the saccharin silver ismost suited as the metal compound (1). Therefore, the saccharin sodium,saccharin potassium or saccharin can also be favorably used for theabove compound (2).

(Fatty Acid Metal Salts)

In the second aspect of the invention, the fatty acid metal salt used incombination with the compound (2) is a fatty acid metal salt of at leastone kind of metal selected from Ag, Cu, Zn, Co and Ni. As the fattyacid, there can be exemplified myristic acid, stearic acid, oleic acid,palmitic acid, n-decanoic acid, paratoluic acid, succinic acid, malonicacid, tartaric acid, malic acid, glutaric acid, adipic acid, and aceticacid. Among them, the stearic acid can be favorably used. The mostdesired fatty acid metal salt will be the silver stearate.

Here, upon using the fatty acid metal salt and the compound (2) incombination, these two compounds may react with each other dependingupon the kind of the fatty acid metal salt and the compound (2) that areused, and the compound (2) coordinates with a metal such as silver ofthe fatty acid metal salt to form the metal compound (1), permitting thesilver ions to be stabilized and often making it possible to obtain thesame constitution as that of when the metal compound (1) is directlycoordinated.

(Metal-Carrying Compounds)

In the third aspect of the invention, the metal-carrying compoundcarrying metal ions used in combination with the compound (2) will be aninorganic ion exchanger or an inorganic adsorbent carrying metal ions ofat least one kind of metal selected from Ag, Cu, Zn, Co and Ni.

The metal-carrying compound carrying metal ions by itself has,generally, been used as an antibacterial agent, and exhibitsantibacterial action as the metal ions are eluted out. In the presentinvention, it is considered that the metal ions and the compound (2)together are made present in the resin accounting for the stablepresence of metal ions, and that the metal ions and the compound (2)elute out simultaneously from the interior of the resin accounting forthe exhibition of excellent antibacterial power.

As the inorganic ion exchanger, there can be exemplified zeolite,zirconium phosphate, potassium phosphate, solubilizable glass, magnesiumsilicate aluminate, calcium silicate, hydrotalcite and calcium apatite.As the inorganic adsorbent, there can be exemplified silica gel andactive alumina. In the invention, however, zeolite and zirconiumphosphate can be particularly preferably used.

(Thermoplastic Resins)

As the thermoplastic resin that can be used for the antibacterial resincomposition of the invention, there can be used any known resins. Forinstance, there can be exemplified olefin resins such as low-, medium-or high-density polyethylene, linear low-density polyethylene, linearvery-low-density polyethylene, isotactic polypropylene, syndiotacticpolypropylene, propylene-ethylene copolymer, polybutene-1,ethylene-butene-1 copolymer, propylene-butene-1 copolymer, andethylene-propylene-butene-1 copolymer; polyester resins such aspolyethylene terephthalate, polybutylene terephthalate and polyethylenenaphthaate; polyamide resins such as nylon 6, nylon 6,6, and nylon 6,10;and polycarbonate resins.

In the present invention, the polyethylene or polypropylene can beparticularly preferably used.

(Thermosetting Resins)

As the thermosetting resin that can be used for the antibacterial resincomposition of the invention, there can be used any known resins. Forinstance, there can be exemplified phenol resin, epoxy resin, urethaneresin, melamine resin, urea resin, alkyd resin, unsaturated polyesterresin and silicone resin.

In the present invention, the silicone resin can be particularlypreferably used.

(Antibacterial Resin Compositions)

In the antibacterial resin composition according to the first aspect ofthe invention, the metal compound (1) is desirably used in an amount of0.001 to 10 parts by weight and, specifically, 0.005 to 1 part by weightper 100 parts by weight of the thermoplastic resin or the thermosettingresin. If the amount of the metal compound (1) is smaller than the aboverange, the antibacterial effect is not obtained to a sufficient degree.The antibacterial effect can be enhanced by increasing the amount to belarger than the above range which, however, is not desirable from thestandpoint of economy and formability.

Here, the antibacterial stands for a state where the multiplication ofgerms is suppressed on the surfaces of the products, and theantibacterial effect is the effect of the antibacterially-treatedproducts as judged in terms of the antibacterially active value or thebacteriostatically active value stipulated under the JIS Z 2801 or theJIS L 1902.

In the antibacterial resin compositions according to the second andthird aspects of the invention, the fatty acid metal salt or themetal-carrying compound is desirably used in an amount of 0.001 to 10parts by weight and, specifically, 0.005 to 1 part by weight per 100parts by weight of the thermoplastic resin or the thermosetting resin,and the compound (2) is desirably used in an amount of 0.001 to 30 partsby weight and, specifically, 0.02 to 10 parts by weight per 100 parts byweight of the thermoplastic resin or the thermosetting resin.

Depending on the use, further, the antibacterial resin composition ofthe present invention can be blended with various blending agents knownper se., such as filler, plasticizer, leveling agent,viscosity-increasing agent, viscosity-decreasing agent, stabilizer,antioxidant, ultraviolet-ray absorber and pigment according to knownrecipe.

The antibacterial thermoplastic resin composition obtained by blendingthe thermoplastic resin with the metal compound (1) or with thecombination of fatty acid metal salt or the metal-carrying compound andthe compound (2), can be subjected to the known melt-forming relying onthe two-roll-forming method, injection-forming method, extrusion-formingmethod or compression-forming method to produce antibacterial resinformed articles in shapes that meet the use as finally formed articles,such as granules, pellets, fibers, films, sheets, containers and thelike.

The temperature for forming the resin formed articles may vary dependingon the forming method or on the kind of the thermoplastic resin, metalcompound (1), fatty acid metal salt, metal-carrying compound andcompound (2) that are used, and cannot be definitely determined, but maybe within a temperature range in which the thermoplastic resin that isused can be formed.

Further, the resin formed articles can be constituted by using theantibacterial thermoplastic resin composition of the invention alone butcan also be constituted in a multilayer structure by using any otherresins in combination.

The antibacterial thermosetting resin composition obtained by blendingthe thermosetting resin with the metal compound (1) or with thecombination of fatty acid metal salt or the metal-carrying compound andthe compound (2), can be favorably used as coating material composition,coating agent or adhesive composition in a customary manner and can,further, be formed into resin articles such as films and sheets.

The heating and curing conditions for forming the coating or the resinformed articles may vary depending on the thermosetting resin, metalcompound (1), or on the kind of the fatty acid metal salt or themetal-carrying compound and the compound (2) that are used, and cannotbe definitely determined, but can be set based on the temperature andtime for curing the thermosetting resin that is used.

EXAMPLES Example 1

A homopolypropylene (F-704NP manufactured by Prime Polymer Co.) wasblended with 0.01% by weight of saccharin silver and was extruded byusing a biaxial extruder (manufactured by Toyo Seiki Seisaku-sho, Ltd.)at an extrusion forming machine setpoint temperature of 180° C. under aforming condition of Q (ejection amount)/N (screw revolvingspeed)=4/150=0.027 to prepare a film 100 μm in thickness.

Examples 2 to 4 and 7 to 16, Comparative Examples 1 to 20

Films were prepared in the same manner as in Example 1 but changing thekind of the silver compound and the amount of its addition as shown inTable 1. The antibacterial agent A in Table was the zirconium typeantibacterial agent (trade name: Novaron (AQ1100) manufactured by ToaGosei Co.).

Examples 5 and 6

A silicone resin (YSR3022 manufactured by Momentive PerformanceMaterials Japan Godo Co.) was blended with the saccharin silver inamounts of 0.01% by weight or 0.1% by weight, and was diluted withtoluene into about 5 times as a whole followed by mixing and stirring.Thereafter, a catalyst (YC6831 manufactured by Momentive PerformanceMaterials Japan Godo Co.) was added thereto in an amount of 4% in termsof the weight of the silicone resin, and the mixture was left to standstill at 50° C. for 3 hours so as to be cured to thereby preparesilicone films.

(Method of Evaluation)

The antibacterial testing was carried out in compliance with the JIS Z2801:2000 (Antibacterially Treated Products—Antibacterial TestingMethod). The bacterial strain was Staphylococcus aureus (S. aureus). Theantibacterially active value stands for a logarithmic value of a numberobtained by dividing the number of bacteria cultivated on the untreatedfilm by the number of bacteria cultivated on the antibacterially treatedfilm.

(Judging the Antibacterial Effect)

The antibacterial effect was judged to be ◯ when the antibacteriallyactive value was not less than 2.0 with the amount of addition of both0.1% by weight and 0.01% by weight. The antibacterial effect was judgedto be Δ when antibacterially active value was not less than 2.0 with theamount of addition of 0.1% by weight but was less than 2.0 with theamount of addition of 0.01% by weight. The antibacterial effect wasjudged to be × when antibacterially active value was less than 2.0 withthe amount of addition of both 0.1% by weight and 0.01% by weight.

TABLE 1 Concentration Antibacterially Kind (wt %) Resin active valueJudged Ex. 1 saccharin silver 0.01 PP 4.9 ◯ Ex. 2 saccharin silver 0.1PP 4.9 ◯ Ex. 3 saccharin silver 0.01 PE 4.9 ◯ Ex. 4 saccharin silver 0.1PE 4.9 ◯ Ex. 5 saccharin silver 0.01 silicone 4.9 ◯ Ex. 6 saccharinsilver 0.1 silicone 4.9 ◯ Ex. 7 silver stearate + saccharin Na 0.01 +0.05 PP 2.2 ◯ Ex. 8 silver stearate + saccharin Na 0.1 + 0.5 PP 4.9 ◯Ex. 9 silver stearate + saccharin Na 0.01 + 0.05 PE 4.9 ◯ Ex. 10 silverstearate + saccharin Na 0.1 + 0.5 PE 4.9 ◯ Ex. 11 silver stearate +saccharin 0.01 + 0.05 PP 4.9 ◯ Ex. 12 silver stearate + saccharin 0.1 +0.5 PP 4.9 ◯ Ex. 13 silver stearate + saccharin 0.01 + 0.05 PE 4.9 ◯ Ex.14 silver stearate + saccharin 0.1 + 0.5 PE 4.9 ◯ Ex. 15 antibacterialagent A + saccharin 0.1 + 0.5 PP 2.3 ◯ Ex. 16 antibacterial agent A +saccharin 0.1 + 0.5 PE 4.5 ◯ Comp. Ex. 1 — — PP 0 X Comp. Ex. 2 — — PE 0X Comp. Ex. 3 silver stearate 0.01 PP 0.2 X Comp. Ex. 4 silver stearate0.1 PP 1.4 X Comp. Ex. 5 silver stearate 0.01 PE 0.5 Δ Comp. Ex. 6silver stearate 0.1 PE 4.9 Δ Comp. Ex. 7 phthalazone silver 0.01 PP 0 XComp. Ex. 8 phthalazone silver 0.1 PP 0 X Comp. Ex. 9 phthalazone silver0.01 PE 0.4 Δ Comp. Ex. 10 phthalazone silver 0.1 PE 2.2 Δ Comp. Ex. 11benzotriazole silver 0.01 PP 0.2 X Comp. Ex. 12 benzotriazole silver 0.1PP 0.8 X Comp. Ex. 13 benzotriazole silver 0.01 PE 0.4 Δ Comp. Ex. 14benzotriazole silver 0.1 PE 2.2 Δ Comp. Ex. 15 1,8-naphthalimide silver0.01 PP 0 X Comp. Ex. 16 1,8-naphthalimide silver 0.1 PP 0 X Comp. Ex.17 1,8-naphthalimide silver 0.01 PE 0.6 X Comp. Ex. 18 1,8-naphthalimidesilver 0.1 PE 0.6 X Comp. Ex. 19 antibacterial agent A 0.1 PP 0.5 XComp. Ex. 20 antibacterial agent A 0.1 PE 0.2 X

As is obvious from Table 1, the films of the Examples exhibitedantibacterial property even with 0.01% by weight of addition of thecompounds. This is because the silver compound is homogeneouslydispersed in the resin as described above and, as a result, silver iseluted out more efficiently than ever before and remains stable assilver ions. The films of the Comparative Examples, on the other hand,did not exhibit antibacterial property or needed the addition of 0.1% byweight of the compounds to exhibit the antibacterial property.

(Testing the Elution of Silver)

Films prepared in Example 2 and Comparative Examples 4 and 8 were testedfor their elution of silver. Two pieces of films measuring 5 cm×25 cmwere thrown into 50 ml of water, and were left to stand therein at 25°C. for 18 hours. Thereafter, by using an emission spectroscope (iCAP6500manufactured by Thermo Scientific Co.), the water was measured for theamount of silver eluted therein. The measured results were as shown inFIG. 2 from which it was learned that the film containing the saccharinsilver permitted silver to elute out more than the films containing thesilver stearate or the phthalazone silver.

INDUSTRIAL APPLICABILITY

Despite of containing the metal compound capable of exhibitingantibacterial property, such as silver, in only small amounts, theantibacterial resin composition of the present invention is capable ofefficiently exhibiting excellent antibacterial power, is advantageous ineconomy, and can be favorably used for the disposable products andproducts in general.

Further, the antibacterial resin composition of the present invention iscapable of effectively inactivating not only bacteria, allergicsubstances, etc. but also true fungi, enzymes having specific stereostructures depending on the arrangement of amino acids, andmicroproteins such as viruses which are particulate substancescomprising DNA or RNA (nucleic acid) and small numbers of proteinmolecules. The antibacterial resin composition can be used in the fieldsof, for example, medicine, daily commodities, bedclothes, buildingmaterials, electronic industries, water-treating facilities and thelike. Concretely, the antibacterial resin composition can be favorablyused for the products or medicinal articles used in the hospitals andthe like, for the products used under high-temperature and highly humidconditions such as in a kitchen, bathroom, toilet, etc., as materialsused in the houses, such as floor, wall, curtain, carpet, coatingmaterial for wall and floor, adhesive and joint mixture, as fiberproducts such as those used for the air conditioners, woven fabric andnonwoven fabric, and as filtering materials such as mask, filter and thelike.

1. An antibacterial resin composition comprising a thermoplastic resinor a thermosetting resin that contains a metal compound represented bythe following formula (1),

wherein M is any one of Ag, Cu, Zn, Co or Ni, and X is an atom selectedfrom C, O, S and P, or an atomic group thereof.
 2. The antibacterialresin composition according to claim 1, wherein said metal compound iscontained in an amount of 0.01 to 10 parts by weight per 100 parts byweight of said thermoplastic resin or said thermosetting resin.
 3. Anantibacterial resin composition comprising a thermoplastic resin or athermosetting resin blended with at least one kind of fatty acid metalsalt selected from Ag, Cu, Zn, Co and Ni, and a compound represented bythe following formula (2),

wherein M′ is any one of Na, K or H, and X is an atom selected from C,O, S and P, or an atomic group thereof.
 4. The antibacterial resincomposition according to claim 3, wherein said fatty acid metal salt iscontained in an amount of 0.001 to 10 parts by weight and said compoundrepresented by the above formula (2) is contained in an amount of 0.001to 30 parts by weight per 100 parts by weight of said thermoplasticresin or said thermosetting resin.
 5. An antibacterial resin compositioncomprising a thermoplastic and/or thermosetting resin blended with ametal-carrying compound carrying at least one kind of metal ionsselected from Ag, Cu, Zn, Co and Ni, and a compound represented by theabove formula (2).
 6. The antibacterial resin composition according toclaim 5, wherein said metal-carrying compound carrying the metal ions iscontained in an amount of 0.001 to 10 parts by weight and said compoundrepresented by the formula (2) is contained in an amount of 0.001 to 30parts by weight per 100 parts by weight of said thermoplastic resin orsaid thermosetting resin.
 7. An antibacterial resin formed body obtainedby mixing, heating and forming the antibacterial resin composition ofclaim
 1. 8. An antibacterial resin formed body obtained by mixing,heating and forming the antibacterial resin composition of claim
 2. 9.An antibacterial resin formed body obtained by mixing, heating andforming the antibacterial resin composition of claim
 3. 10. Anantibacterial resin formed body obtained by mixing, heating and formingthe antibacterial resin composition of claim
 4. 11. An antibacterialresin formed body obtained by mixing, heating and forming theantibacterial resin composition of claim
 5. 12. An antibacterial resinformed body obtained by mixing, heating and forming the antibacterialresin composition of claim 6.